Hey, you guys are really missing the point about Cybook/mobipocket.
The big advantage this implementation offers is for content creators. Mobipocket is open to just about any author/publisher who wants to upload their ebook. Yes, mobipocket takes their cut (I think it's 40%) and the contracts have their restrictions, but it's unlike Sony or Fictionwise where you have to go through hoops just to get your content listed.
The only other distributor positioned to take advantage of independent publishing is Lulu, but they only let you upload .doc and .pdf's.
I asked them about .epub uploads on this thread.
http://www.lulu.com/forums/viewtopic.php?t=72973 (No reply so far).
My reason for buying the Cybook is not for the better features (although that is certainly a plus) but the wider availability of content, most of which began as ebooks.
I find it hard to believe that ebooks offered by lone authors would be more expensive than typical books. For the first time in a long time, we have a level playing field in publising.